[1,4]Dithiepino[2,3-b]furans from Oxiranecarbaldimines and Lithiated 1,3-Dithiane: A Series of Rearrangement Reactions in One Pot
作者:Kristin Michel、Christoph Glotzbach、Roland Fröhlich、Ernst-Ulrich Würthwein
DOI:10.1002/ejoc.201101323
日期:2012.2
two-step procedure, were converted into [1,4]dithiepino[2,3-b]furans 5 by the addition of lithiated 1,3-dithiane and subsequent aqueous workup under acidic conditions. In case of bis(imine) 6, the isolation of the intermediate bis(aziridinyl alcohol) 7 was possible and resulted from an aza-Payne rearrangement. Acid treatment of 7 led to the bis(furan) 8. According to quantum chemical calculations, the
通过添加锂化的 1,3-二噻烷和随后在酸性条件下进行水处理,可通过两步程序轻松获得 Oxiranecarbaldimines 1,将其转化为 [1,4] 二噻吩并 [2,3-b] 呋喃 5。在双(亚胺) 6 的情况下,中间体双(氮丙啶醇) 7 的分离是可能的,并且是由氮杂-佩恩重排产生的。7 的酸处理导致双(呋喃) 8。根据量子化学计算,酸催化步骤的关键步骤是 1,3-二噻烷的扩环和氮丙啶同时开环。几种 [1,4] dithiepino [2,3-b] 呋喃衍生物 5 和 8 通过 X 射线衍射表征。